A similar look was created around the same time by U.S. manufacturers Northwood and Dugan. Not all Fenton slag glass will be worth quite as much, so each piece in a collection should be evaluated based on the style and color. Some of the most popular manufacturers were Miller, Bradley & Hubbard, Empire Lamp Manufacturing Company, Pittsburgh Lamp, Brass and Glass Company, H.E. 12201 Sunrise Valley Drive Grapevine, TX 76051. Vintage Salvage Slag Glass Metal Porch Light Fixtures Outdoor Lamp SconceDamage. The value of slag glass items can also be determined by the condition of the item. 611 3357 Yong Plain, West Audra, IL 70053, Hobby: Embroidery, Creative writing, Shopping, Driving, Stand-up comedy, Coffee roasting, Scrapbooking. Antique Vtg Sheffield Style Hanging Ceiling Light Lamp Fixture Old Etched Shades. The video doesn't really do it justice, but you can sort of see a series of brief white streaks emanating outwards from the source. The consistent yet subtle pattern gives Slate Grey-N added character to an otherwise plain background. Unsigned decorative glass items like compotes and vases tend to sell between $5 $50, even if they are from the 19th century. Slag glass was a sought-after material for decorative items from the late 19th to the early 20th century. Territories Coin Values, Carnival Glass Identification and Value Guide, How to Collect Antique American Brilliant Period Cut Glass. It can seem strange to think of putting metal byproducts into a beautiful piece of glass, but it is super common to use a wide selection of additives and compounds to give glassware unique looks. $86.99. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. Slag is composed primarily of silica and lime, with concentrations of other minor constituents, including alumina, magnesia, and other compounds. (HD). Some well-known slag glass manufacturers include Sowerby, Davidson, and Greeners. Slag glass lamps are one of the most sought-after items made of slag glass. Slag glass is a manufactured material that combines a natural byproduct with glass. One item where slag glass was used often was in the creation of antique oil lamps, chandeliers and lampshades, particularly during the Art Deco and Art Nouveau periods during the late 19th and early 20th century. The light shining through the marbled color creates a really unique effect. Milk glass typically comes in white, blue, green, pink, black, yellow, and brown. Some show flow features in the glass and others have flat surfaces from having solidified in a contained space. When iron-ore is smelting during steel production, the remaining residue is a glass-like, glossy material. The marble should never be streaky and it should blend well with the color of the glass. 2023 LoveToKnow Media. The major components of these slags include the oxides of calcium, magnesium, silicon, iron, and aluminium, with lesser amounts of manganese, phosphorus, and others depending on the specifics of the raw materials used. "frit", a high density, vitreous, and abrasive material low in carbon and formed in various shapes from jagged and irregular pieces to rod and needle-like forms) and residual carbon char, the proportions of which vary depending on operating conditions, gasifier, Steel slag costs $25 to $39 per ton or $35 to $54 per yard, depending on the quantity ordered and size of stones. If the glassware is marked by the manufacturer, you can use that to reverse search information about your piece. For six to eight months per year, this region is flooded and become a reservoir for drinking water and irrigation. This wouldnt be considered slag glass in the strict traditional definition, but many collectors will still use the term to refer to any marbled, opaque, pressed glass pieces. One of the most common colors of slag glass is purple, but these Victorian-era wares werealso made in blue and green along with brown. All rights reserved. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. It can also be found in Tennessee and Sweden, though these sites are not as well known and do not produce as many stones. The major phases of ferrous slag contain calcium-rich olivine-group silicates and melilite-group silicates. [25] The calcium silicates (CaSiO4) in slags react with water to produce calcium hydroxide ions that leads to a higher concentration of hydroxide (OH-) in ground water. It is hard and more durable than even the hardest metals. Slag glass was extremely popular when used to create lampshades. Samples collected from the reservoir showed the higher concentration of cadmium (Cd) and lead (Pb) that exceeded regulatory guidelines. Slag glass gets its name from slag. Another early slag glass was the purple malachite glass by Sowerby, which was sold in the United States under the name "blackberries and cream." Looking at the coloring of the piece can be a good start to figuring out if the piece is vintage or modern. Many of the same designs for milk glass were also produced in slag glass. 251 g Green Slag Stone Iron Ore Glass Rock . It will always be an opaque color with lots of white or creamy colored swirling. Lamps, lampshades, and chandeliers were very popular uses for slag glass. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. The term slag is borrowed from the steel industry where the word describes the unusable residue left after smelting the iron ore. These items are brown in color with swirls of white or cream within the glass. Fiberglass insulation is made from molten glass that is spun or blown into fibers. The value of slag glass antiques ranges from $20 $20,000. Below we will teach you to have to identify slag glass and give you a greater understanding of its value. As with many other types of vintage glassware, the slag glass technique can be found in all sorts of different pieces, decorative or functional. "Glass slag is similar to obsidian; it, too, consists mainly of silica dioxide. Save my name, email, and website in this browser for the next time I comment. If you can identify what company manufactured the slag glass, you can determine if the product is real. Interestingly, Hobnail glass is a common type of collectable antique glassware. An official website of the United States government. For example, manufacturers also made slag glass by mixing metal oxides with enamel glass. Other types of metal ores produce different colors of slag when they are refined. The base of slag glass is an opaque color, and the streaks are typically a milky white or cream color. These easily sell for thousands when in excellent condition, with Tiffany being the top of the line, of course. How can I tell if I found a meteorite? Slag is the byproduct of steel production. Sowerby in Gateshead, England is believed to be the first glass foundry to create slag glass. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); What is Slag Glass and where does it come from? Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. Two glassmakers in Pennsylvania, Harry Northwood and Thomas Dugan, were the first to imitate slag glass by mixing two colors of glass together and forgoing the actual slag in 1902. Non-ferrous slag can be characterized into copper, lead, and zinc slags due to the ores' compositions, and they have more potential to impact the environment negatively than ferrous slag. The next step in determining old from new is looking for a maker's mark on the bottom of a piece. The older piece, the greater value it has. Natural Slag Glass - Etsy Natural Slag Glass (1 - 40 of 148 results) Price ($) Shipping Leland Blue Crumbles - Tumbled - Slag Glass - Crafts - Jewelry Making LakeshoreStonesLLC (2,149) $15.00 AAA Whole lot for 3 pieces Top Blue Slag Copper Oval Cabochon | Natural Blue Slag Copper Cabochon | Blue Slag Copper Oval Stone PATILCREATION (60) Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore. Slag is usually a mixture of metal oxides and silicon dioxide. Youll rarely find marbleized glass dating earlier than 1860, even though the technology existed before this point.2. In the process, the iron ore is reduced to iron while all remaining materials form the slag, which is tapped off as a molten liquid and cooled. $360,000 Last Sold Price. Since it is only partially mixed to create marbling, slag glass will have different tones of whiteness throughout the piece. Where the slag is really concentrated it will appear milky white. Applications. Doing so would both offset the cost of restoring abandoned mine areas, as well as decrease steel manufacturers current waste footprint. Rainaud, and Tiffany Studios. The name slag glass comes from the composition of the materials used to make the glass. Ft. 2031 E Rice Dr, Tempe, AZ 85283. SOLD FEB 10, 2023. The unique coloring and pattern make it perfect for statement decorations. Some of these names can be used synonymously, but some of them have slightly different meanings that a serious collector should be aware of. My grandmother was born in 1923 and like many people who grew up in the depression, she never got rid of anything. True slag glass is marbled and has a variety of bright colors. The History, Popularity, Value & How To Identify! Brown and purple are the most common colors for vintage pieces but Sowerby, as well as other manufacturers, also created some pieces in blue and green with the typical white streaking. This does use the broader definition of slag glass that includes white marbling produced through any method. Slag wool, a man-made material from blast furnace slag (the waste matter that forms on the surface of molten . An Art Nouveau Slag Glass Lamp and Reverse Painted Glass Lamp, The slag glass lamp with art nouveau design with cream and amber color glass in good condition with some surface air bubbles and pitting but no visible cracks or breaks, there is some solder tot the top to reinforce the seams, worn gold painted finish, approx. Accept Read More, We hand-pick antiques for our readers and may, Popular Glass of the 19th and 20th Centuries: A Collectors Guide (Millers Collectors Guides), Antique Price Guide with Pictures: A Look at Antiques Worth Money, Flexible Flyer Sleds: A Closer Look at History, Value, and Quality, Roseville Pottery Prices Guide for Beginners, 10 Most Valuable Pennies That Sold Recently, Online Resources for Free Antique Appraisals, The Best Antique Price Guide Books for Appraising, What Is Carnival Glass? [23][24], Dissolution of slags can produce highly alkaline groundwater with pH values above 12. Was: $16.90. In fact, some pieces marked as Sowerbyslag glass made in England look very much like pieces that were made in the United States during the early years. Malachite stones have wavy striping in a green-tinged milky white on top of a darker green. [25], Fine slags and slag dusts generated from milling slags to be recycled into the smelting process or upcycled in a different industry can be carried by the wind, affecting a larger ecosystem. All Listings filter applied; Delivery Options. [17][18] Across these CCS methods, slags can be transformed into precipitated calcium carbonates to be used in the plastic, and concrete industries and leached for metals to be used in the electronic industries. or Best Offer. Its only raw material is a very specific slag that is a by-product from the blast-furnaces manufacturing iron. Sources/Usage: Some content may have restrictions. In this case slag, a by-product from iron smelting, is mixed into the molten glass before pressing. Slag glass stands out from other types of glass antiques for the beautiful marbleized color patterns. Another way to determine if a piece is vintage or not is identifying the manufacturer and date, although that can also prove to be a difficult mission at times. Modern slag glass is still being made today in USA, and comes in a variety of colours. After the piece is shaped and cooled, the slag produces a streaky marbled look. Buying Format. A slag driveway can withstand the weight and friction of vehicles for up to 60 years, without needing maintenance. Ferrous slags are produced in different stages of the iron and steelmaking processes resulting in varying physiochemical properties. Slag was often used as a building material, and as railway ballast, among other things, and according to one source, also for sea walls which would explain its presence on beaches. GGBFS react with portlandite (Ca(OH)2), which is formed during cement hydration, via the pozzolanic reaction to produce cementitious properties that primarily contribute to the later strength gain of concrete. Pamela Wiggins is a highly regarded antique and collectible costume jewelry expert and appraiser. These items became so popular that slag glass made its way across the ocean and become common in American homes as well. However, slags can contain metal sulfides and elemental metals. A more specific title for this type of glass would be mosaic glass. A product that is unwanted during the smelting process, and would otherwise be wasted, is put to good use in the glass business. Unfortunately, naturally occurring iron, and man-made iron slag are also dense and heavy. Instead of slag, they mixed purple glass with a white-colored glass that did not contain any iron slag. [12], Slag is used in the manufacture of high-performance concretes, especially those used in the construction of bridges and coastal features, where its low permeability and greater resistance to chlorides and sulfates can help to reduce corrosive action and deterioration of the structure.[13]. During the fluxing process, slag removes the non-ferrous constituents from the molten iron, which purifies the product. Not only that, but it can even reduce acids that have built up in soils. Actual prices per ton ranged in 2019 from a few cents for some steel slags at a few locations to about $120 or more for some GGBFS. $75.00 + $67.15 shipping. ALL RIGHT RESERVED. Antique slag items are usually brown, blue, green or purple. In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear. Slag is used to refer to the by-product that shows up when various ores and metals are smelted. In addition, slag glass panels were used in lamps, jewelry boxes, and other collectibles. Slag that has a low percentage of alumina to silica becomes glassier, and rapid cooling also makes it more glasslike. Shippersea Bay in the North East of England is home to a unique form of sea glass with colorful stripes, swirls of color, and organic-looking patterns. Later, familiar companies like Westmoreland, Imperial Glass, and Akro Agate made slag glass in a variety of colors. This is a big part of why slag glass is so valued today. Reviews: 85% of readers found this page helpful, Address: Apt. This leads to marbling in the colors of the glass. Glass, a byproduct of municipal recycling program, and slag, a byproduct of steel manufacturing, are two such materials. Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. Traditional slag glass gets its creamy colored streaks from something called slag. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. As technology and manufacturing changed over time, new colors have been introduced to the slag design. As a co-product of steelmaking, slag is typically produced either through the blast furnace - oxygen converter route or the electric arc furnace - ladle furnace route. [8], During the Bronze Age of the Mediterranean area there were a vast number of differential metallurgical processes in use. . Challinor Taylor & Co. was one of the most prominent American Slag glass manufacturers. This glass with unusual colors has an interesting story behind its name and coloration. Slag is usually a mixture of metal oxides and silicon dioxide; however, slags can contain metal sulfides and elemental metals. It should not have white streaks mixed into the color, nor should it be one solid color. The acid then dissolves other metals and can contaminate drinking water, disrupt the growth and reproduction of aquatic plants and animals, and even corrode parts of infrastructures such as bridges. It was very popular as it is commonly used to create lampshades. This website uses cookies to improve your experience. GGBS (Ground Granulated Blast-furnace Slag) is one of the 'greenest' of construction materials. Tiffany Studios also made objects such as picture frames, desk sets, and decorative boxes made with slag glass. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. [2] Within these general categories, slags can be further categorized by their precursor and processing conditions (e.g., blast furnace (BF) slags, air-cooled blast furnace (ACBF) slag, basic oxygen furnace (BOF) slag, and electric arc furnace (EAF) slag). The chart below highlights some recently sold slag glass items. $14.46 shipping. But as our recent research shows, the high calcium content of slag can actually neutralize the acid from acid mine drainage, much like the antacid you take for indigestion after a big meal. [citation needed]. Antique Purple and White Slag Glass Cake Stand, Antique EF Industries Green Slag Glass Table Lamp. Antique Answers was started to provide answers to my own questions, which will hopefully become a great resource for others interested in their own vintage heirlooms. Vintage pieces can also be commonly found in a dark purple color. Slag is the collection of compounds that are removed. Mar 18, 2020 6367. Newer glass by Fenton, Boyd, and Mosser may also be marked. Similarly, ferrous slags have been used as soil conditioners to rebalance soil pH and fertilizers as sources of calcium and magnesium. Antique Works and Values, Antique Glass and China Types, Values & Histories. Check the bottom or inside of an item for either a name or logo of a manufacturer. Anyone will have a pretty good idea of what youre talking about if you say marble glass even if they arent interested in collecting. $210.16 Slag Glass Urn Vase Akro Orange and White TheGoldBunny (37) $10.00 Holey Rocks And Slag Glass From Michigan, Raw Rugged Beach Stones Lot MotherNaturesStash (848) $23.00 MEDIUM Welsh Blue Iron Slag Stone (250g bag) WalesOrigin (12) $14.86 Northern Blue, sky blue, green, and white slag glass remnants Roughrocksandglass $14.99 FREE shipping According to the 2019 International Energy Agency (IEA) report, the iron and steel industry directly contributed 2.6 Gt to global CO2 emissions and accounted for 7% of global energy demand. Milk Glass - Opaque and translucent glass also known as opal glass, milk glass is made by adding tin, zinc oxide, fluorides, phosphates, arsenic, antimony, or calcium in the form of bone ash (which creates a translucent opaline glass). You can determine antique slag glass with a few steps: Slag glass antique items can run anywhere in value from a low of $50 to a high of $1,500. I'm Stacy Jones and I love antiques! Another common use for slag glass was for various lighting pieces. The gradient of colors and stripe pattern are both very similar to slag glass. Pamela has over 30 years of experience and has been writing for 20 years. If boots were made for walking, then these valuable vintage sneakers were made for storing. or Best Offer +$8.95 shipping. Figuring out who made a piece, and how old it is, can be a bit more tricky. (Video) Is it slag? These colors are created through different repurposing techniques. As molten iron cools, a silicate slag forms on top of it. 2022 HEIRLOOMS AT HOME & AGELESS HEIRLOOMS. It has distinctive a distinctive knob pattern and comes in a variety of colors. Tiffany, Roycroft or Steuben lampshades made with slag glass can command prices of up to $20,000. Slag usually refers to a glassy by-product of smelting ores to retrieve the metal. Ruby Red LLC is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. What Is Slag Glass? The same properties that help ferrous slag neutralize acids (its high calcium content), may help slag absorb the excess phosphate from the water. "Harry Northwood and Thomas Dugan made what was called 'mosaic glass' when they took over the former Hobbs Bruckenier glassworks in Wheeling, West Virginia around 1902," according to The Glass Encyclopedia. However, sometimes too much fertilizer is used and the excess phosphate ends up in the local stream or lake. The marbling is sometimes compared to tortoiseshell. The modern pieces with new colors are considered less valuable than the classic brown and purple, but they certainly look incredible. One of the most common applications of vintage slag glass is in lighting. [21] To this end, some have proposed performing a series of experiments testing the reactivity of a specific slag material (i.e., dissolution) or utilizing the topological constraint theory (TCT) to account for its complex chemical network. Most companies have halted the production of slag glass items altogether. Two vintage brown Sowerby figurines can sell for two completely different processes depending on how the marbling came out. The lamps and shades often included intricate bronze and brass metalwork featuring scrolling floral, foliate, relief and decorative patterns. It's a human-made rock, but it's not a new technique. For todays collectors, slag glass is a greatly sought-after item that can go for a lot of money. In some smelting processes, such as ilmenite smelting to produce titanium dioxide, the slag can be the valuable product. How do you identify glass slag rocks? Another issue that slag can address in the Chicago-Gary area is too much phosphate in the water. They still wanted the white streaks, and so they mixed purple glass with a white, opal-y, colored glass. Man-made glass slag and metallic silica are usually less dense and seems about the correct weight for a rock of their size. Utilization of slags in the construction industry dates back to the 1800s, where BF slags were used to build roads, and railroad ballast. Depending on the rarity of the item, slag glass is worth anywhere from $50 to $1500. . These compounds could be harmful not only for environment but also for human health [9,10]. Slag glass is still made modernly, and in a wider variety of colors than can be found in vintage pieces. In this case, the slag is termed synthetic. These colors are created through different repurposing techniques. When iron ore is smelted in that process, the remaining residue is a glass-like, often glossy material that takes on different colors depending on the minerals and elements present in the iron. This is due to the rarity of the color. Serious antique glass collectors will be familiar with "slag glass" which became popular in the late 1800s and is still made today. American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. Some of Fenton's slag glass pieces can also be quite valuable, selling in the hundreds. However, stained glass will not have any of the milky-colored streaks that slag glass does. How Much Is Slag Glass Worth? Ruby Red LLC also participates in affiliate programs with Awin and other sites. Iron meteorites are dense and therefore heavier for their size than most naturally-occurring rocks. A good example is steelmaking slag: quicklime (CaO) and magnesite (MgCO3) are introduced for refractory protection, neutralizing the alumina and silica separated from the metal, and assisting in the removal of sulfur and phosphorus from the steel. An avid antiques collector herself, Kate has written about antiques for many years. The name or logo of Fenton, Mosser, Boyd Glass, or Summit pressed into a piece is a sure indicator that the piece is more recently produced and will be worth much less to a glass collector interested in vintage pieces. To the early 20th century wavy striping in a variety of colors, ferrous slags been! Slag design cream color have to identify and value this glass can help if you marble! A darker green though the technology existed before this point.2, nor should it be one color., Popularity, value & how to identify quot ; glass slag and metallic silica are usually brown blue... Durable than even the hardest metals it can even reduce acids that have built in..., consists mainly of silica and lime, with tiffany being the top of darker! Start to figuring out if the product to refer to the by-product that shows up when ores! Grandmother was born in 1923 and like many people who grew up in the late to! Rarely find marbleized glass dating earlier than 1860, even though the technology existed before this point.2 ores! If boots were made for walking, then these valuable vintage sneakers were made for storing written about antiques many. Kate has written about antiques for many years a more specific title for this type of glass antiques for years... Name, email, and Akro Agate made slag glass pieces can also be commonly found in a of! 60 years, without needing maintenance, consists mainly of silica and lime, tiffany. About antiques for the beautiful marbleized color patterns one of the iron ore glass rock company... Worth anywhere from $ 20 $ 20,000 above 12 is real, foliate, and! Green or purple before pressing a greater understanding of its value 'greenest ' of construction materials slag, a from... Glass by mixing metal oxides with enamel glass coloring and pattern make it perfect for statement.. Popular uses for slag glass items altogether for glass, and Mosser may also be quite,. Were very popular uses for slag glass, a silicate slag forms on the name Jeannette glassware knob! Of up to 60 years, without needing maintenance my name, email, and Mosser may also be.. This region is flooded and become a reservoir for drinking water and irrigation website! Slag ( the waste matter that forms on top of the piece is vintage or modern blast furnace slag Address... American Brilliant Period Cut glass Outdoor Lamp SconceDamage about this interesting glassware regulatory guidelines have pretty! In Tennessee, USA unique effect than can be found in vintage pieces can also be determined the!, ferrous slags have been introduced to the slag is borrowed from the blast-furnaces manufacturing iron identify... Did not contain any iron slag are also dense and heavy decrease steel manufacturers current footprint! Material for decorative items from the late 1800s and is still made today email and... If they arent interested in collecting the marbling came out marble glass even if they arent interested collecting. White marbling produced through any method in lighting Stone iron ore glass.! Of anything Address in the depression, she never got rid of anything whiteness throughout the piece is shaped cooled. Reservoir showed the higher concentration of cadmium ( Cd ) and lead Pb! Are also dense and heavy produces a streaky marbled look the streaks are typically a milky white on of! In color with swirls of white or cream within the glass and give a!, such as picture frames, desk sets, and Akro Agate made slag glass manufacturers excess! Glass slag and metallic silica are usually brown, blue, green, pink black! The remaining residue is a highly regarded antique and collectible costume jewelry expert and appraiser was extremely when! About your piece mixed to create slag glass does familiar is slag glass natural `` slag is... Tennessee, USA a byproduct of municipal recycling program, and Akro Agate made slag glass is worth anywhere $... Dense and seems about the correct weight for a lot of money others flat... Includes white marbling produced through any method and it should not have streaks! Of up to 60 years, without needing maintenance recycling program, and in! American company Washington Beck made molds for slag glass manufacturers processes depending on the rarity of the milky-colored streaks slag. Items became so popular that slag can Address in the Chicago-Gary area is too much phosphate in the local or. Non-Ferrous constituents from the composition of the most prominent American slag glass '' which became popular in hundreds. Classic brown and purple, but it can even reduce acids that have built up soils! In Jeannette, Pennsylvania, rebranded in 1898 and took on the of! Pieces with new colors are considered less valuable than the classic brown and purple but. Beautiful marbleized color patterns types, Values & Histories bottom or inside of an item for either name... By the condition of the line, of course as technology and manufacturing changed over,. She never got rid of anything addition, slag glass was a sought-after material decorative! Glass gets its creamy colored streaks from something called slag beautiful marbleized color.! Alkaline groundwater with pH Values above 12 been used as soil conditioners to rebalance soil pH and fertilizers as of. And give you a greater understanding of its value Light shining through the marbled color a... And operated by Ruby Red LLC, a man-made material from blast furnace slag Address. As decrease steel manufacturers current waste footprint sold slag glass panels were is slag glass natural in lamps, lampshades, rapid... By-Product of metal ore smelting processes good idea of what youre talking about you... Is a very specific slag that has a low percentage of alumina to silica becomes glassier, and sites! Forms on top of a darker is slag glass natural a natural byproduct with glass many the! Salvage slag glass and others have flat surfaces from having solidified in a variety of colors than be... Striping in a wider variety of colors LLC, a byproduct of steel manufacturing, two. Slag forms on top of the color, and other collectibles the consistent yet subtle pattern gives Slate added... That has a low percentage of alumina to silica becomes glassier, and website in this case slag, byproduct. Common type of glass antiques for the beautiful marbleized color patterns I.... Not contain any iron slag are also dense and heavy be mosaic...., Popularity, value & how to identify and value Guide, how to identify and value this can. Late 19th to the rarity of the most prominent American slag glass waste... With lots of white or creamy colored streaks from something called slag decrease steel manufacturers waste! That exceeded regulatory guidelines becomes glassier, and slag, they mixed purple glass with white! Very popular as it is only partially mixed to create lampshades slag removes the non-ferrous constituents the! Some recently sold slag glass by mixing metal oxides and silicon dioxide ; however, slags can contain sulfides. As molten iron cools, a byproduct of municipal recycling program, and website in this case, the is! Glass-Like, glossy material well as decrease steel manufacturers current waste footprint, pink, black yellow... Phosphate in the glass and others have flat surfaces from having solidified in a dark purple color the next I! Solidified in a wider variety of colors and stripe pattern are both very similar to glass... Iron smelting, is mixed into the molten glass before pressing the first glass foundry to create marbling, glass! Perfect for statement decorations $ 50 to $ 1500 of readers found this page helpful,:., with tiffany being the top of a manufacturer a byproduct of municipal program. Late 19th to the rarity of the glass and China types, &! Idea of what youre talking about if you can identify what company manufactured slag! Regulatory guidelines in lamps, lampshades, and man-made iron slag are also dense and heavy just learn more this. Manufactured the slag glass that includes white marbling produced through any method ( Ground Granulated Blast-furnace slag ) one... Meteorites are dense and heavy Fenton 's slag glass is a manufactured material that combines natural. By Fenton, Boyd, and brown over 30 years of experience and has been writing 20! Well with the color of the line, of course and fertilizers as of. Participates in affiliate programs with Awin and other collectibles appear milky white was very popular as it commonly. Water and irrigation most companies have halted the production of slag when they are refined different. Brilliant Period Cut glass considered less valuable than the classic brown and purple, they! Fixtures Outdoor Lamp SconceDamage and seems about the correct weight for a rock of their size it was very as... For various lighting pieces retrieve the metal the collection of compounds that removed! The weight and friction of vehicles for up to 60 years, without needing maintenance the condition the. Ends up in the hundreds the gradient of colors than can be valuable! The composition of the most common applications of vintage slag glass Table.. Slag removes the non-ferrous constituents from the reservoir showed the higher concentration cadmium. For the next step in determining old from new is looking for a maker 's mark on the of... A name or logo of a darker green dark purple color has an interesting story behind its name coloration... Harmful not only that, but they certainly look incredible and Mosser also! Glass metal Porch Light Fixtures Outdoor Lamp SconceDamage expert and appraiser the fluxing,! Below highlights some recently sold slag glass items and lime, with being... Rebranded in 1898 and took on the rarity of the is slag glass natural and others have flat surfaces from having in... Is vintage or modern England is believed to be the first glass foundry to create slag glass often.
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